Wrong, BW hasn't the best musics among all the fantastic Pokémon games, but it has great soundtracks. I don't really like the battle themes to tell the truth. Those from previous games were better to my mind.
However, the city songs were very good. I love Drifteil's theme. Yes, I know, it's not the most elaborated soundtrack, but... I love it. It drives me on a good mood. Village bridge's sound is also very beautiful, it's calming.
And my favourite one's the awesome N's castle music. It's a real delight for ears, and has something totally epic.